Rotary pump



Feb'.21,1928.' 1,660,183

v EDEN Filed Oct. 21. 1926 2 h ts Sheet 1 Inviaznror. Arthur W. Weeden Feb. 21, 1928. 1,660,183

A. w. WEEDEN ROTARY PUMP I Filed 001;. 21 1925 2 Sheets-Sheet 2 a Fig. 3. a

Inventor. Arthur W. Wee den Patented Feb. 21, 1928.

UNITED" STATES PATE NT OFF-ICE.

ARTH R w. WEEDEN, or corner, iussacnusn'rr's, .issmnon, or THEEE-FIFTHS r0 ELLA III. FREEMAN, OE MASSAUHUSETTS.

ROTARY rm.

Application filed October 81, 1926. Serial No. 143,129.

This invention relates to rotary pumps and it has for one of itsobjects to provide ,a novel rotary pump which is relatively simple in construction and in which the rotating parts are reduced to a minimum.

A furtherobject of the invention is to provide a rotary pump having means for automatically decreasing the amount of fluid pumped as the pressure increases beyond a predetermined point soas tomaintain a constant load on the pump and prevent the lat- .ter-fromi becoming stalled by an increase of pressure.- H

' F urther. objects of the invention are to im- ;prove generally. rotary pumps in various .ways all as will be more fully hereinafter set forth.

. In order to give an understanding of the invention I have illustrated in the drawings :3. selected embodiment thereof which will now. be describedafter which the novel features will be pointed out in the appended claims.

Fig.1 is a sectional view through a pump embodying my invention taken on substantially the line 1--1, Fig. 3;-.

Fig. 2 is a fragmentary s'ection'on the line 2-2, Fig. 1; "Fig.3 is a section on Fig. 4 is aperspective the line 3-'3,- Fig. 1; view of one of the partition members;

Fig. 5'. is a fragmentary section on the line 5-5, Fig. 4;

Fig; 6 is a view of the member acting on .thezspri'ng situated within the cam.

The pump comprises a casing, a rotatable "acam member within the'casin and a plu- 'ra'lityv of partitions engaging t e cam memher and. extending; outwardly therefrom imagenei'al radial direction, said partitions dividingthe interior of the'casmg' into separate' pumping chambers, eachhaving an inlet valve and an: outlet valve, the construction being. such that-asthe cam is rotated the chambers arev alternately enlarged and contracted, .therebyperforming the pumping p operation.

The casing mayfbe made in various ways without departing from my invention. As herein shown it comprises a body member 1 'in'the form of an annular ring and-two side plates-2 and 3-engaging the ends of the annular member and forming with the latter a central chamber, which, as presentlyto; be.

" The space within the annu tively. The

described, is sub-divided by partitionsinto separate pumping chambers. The side plates 2 and 3 may be secured to the annular member 1 .in various ways Without departing from the invention. In the construction herein shown, which I regard as a practical one, said plates are retained in position by clampingmembers 4 and 5, these members having inclined annular faces- 6 which'engage inclined faces 7 formed on the periphery of the side plates 2 and 3.

The clamping members 4 and 5 areeach provided with annular flanges8 and these flanges are clamped together by clampingbolts 9. By reason of this construction the.

tightening of the clamping bolts 9 wedges the inclined ,faces 6 of the clamping members against the inclined faces 7 of the side plates 2 and 3 and also clamps the side plates :between it and the plate 3, which spaceconstitutes a suction or supply chamber forthe pump, said space communicating by means of an inlet pipe 11 with any suitable source of su ply. Similarly, thev clamping member 4 is s aped to form between it and the side plate 2 a compression chamber 12 into which the fluid is pumped under pressure, said compression chamber having an outlet pipe 13 leading the rpfrom.

Situated within the annularmember 1 is a rotary cam device indicated generally by 15 which extends through the plate 3 and clamping member 5 and is driven by any suita a pulley or gears (notshown) lar member and the; cam 14 1s divided-into a plurali 9f umping chambers by partition mem rs 16, there being as many suclipumping cham bers asthere are partition members. In the construction herein shown there are six such partition members and, therefore, six pumpin chambers, the pumping chambers being in 'cated at 17, 18, 19, 20, 21.an d 22 respecartition members have a general radial lrection but I preferably "14. Said cam device-is mounted on a shaft 1e driving means, such for instance as ioo -make each of them of an arcuate shape.

Each partition has a radius arm 23 rigid therewith which'is pivotally secured within the central chamber of the casing to the inner wall of the member 1 as shown at 24. The arm 23 of each partition extends at right angles to the arcuatecurve thereof and each arm is of such a length that the pivotal connection 24 is located at the center of said arcuate curve.

The member 1 istormed with curved slots 25 in which the free or outer ends of the partition members 16 are received.

Each partition has pivoted to its inner edge a shoe 26 which rests on the periphery of the cam member 14. Since the cam is situated eccentrically within the annular member 1 the-rotationof the cam will move the partitions outwardly, each partition during its outwardimovement swinging about its center 24. f The-partitions are maintained in engagementwith the peripher of the cam 14 by .means of pressure intro uced into the cha nbers 25, this pressure acting on the ends of the partitions'and holding-the shoes 26 in contact with the'cam 14.

"Each pumping chamber*1-7-,

" an inletfvalve-27'leading thereto from the suction chamber I'Oand an outlet valve 28 leading therefrom to the compression cham-" "ber 12.-- Each suction valve is mounted in a cage"29 which is screwed into and-opening into the side plate 3 and eachvalve is acted in'the side I plate 2- andeach outlet valve is on by a spring '30 which yieldingly holds it to'its seat; Each valve 27 is fan nwardlye opening valveyso thatit will open when. suction-is developed. in corresponding chamber.

Each'outlet .va'lv 28, s a lsogmounted in a cage 31' which" is' screwed" intolan opening yieldingly held to'its seat'by' a spring 32.

he outlet or; discharge valves- 28 openout-f 'wardly into the chamber l3fabyarprepon derance .oit pressure in} the" pumping chamher. v,

With this arrangement it. will be seen from Fig. 1 especially that as the cam 14 rotate's clockwise each pumping chamber will be gradually reduced in size. between the time that the low point of the cam and the high point of the camv pass said chamber and will gradually increased in size between thet me thatthe high point of the g ,cam andythelow point of the cam pass .said

a chamber. c

- y In Fig. 1 the chamber 22 is at its mini I, mum capacity and the chamber 19 atuits,

. gradually diminished untilthe high point maximum capacity. As the cam 14 turns clockwise. the chambers 17, 18, 19 will be 'otthecam passes each chamber while-the 3 other chambers will be until, the lowpoint of gradually increased t e cam ha passed each chamber. The cam 14 is shown as an eccentric as this gives a smooth vibratory movement to the partitions 16.

As each pumping chamber increases in size its inlet valve will beopened by the suction created therein and water or other liquid will be admitted from the supply chamber 10, the discharge valve for each chamber at such time being closed, while I have stated above that the chambers 25 had pressure in them to maintain the partitions in contact with the cam 14. This result is secured by connectin each. chamber 25 to the compression chamber 12 through a duct 33, (see Fig. 2). Each chamber 25 will thus have in it the full pressure in the chamber 12 which 'issulficient to maintain the, shoes 26 in'engagement with the cam 14. The amount of liquid which is pumped 'f depends upon the extent to which each pumping chamber is expanded or contracted andthis is determined by the eccentricity of the cam H 14, I have provided herein means whereby this eccentricity will be varied automatically as the pressure increases so as to prevent-the pump from becoming stalledfwhenidelivering under a high pressure. v

Thecam 14' jiS -.made.sectional, it comprising aninner eccentric 34 which is fast on the shaft .15 and an outer eccentric member 35 which surrounds the eccentric 34. These two' eccentric members 34, 35 are yieldingly :conn'ectedfthrough the medium of springs 36. There are two such springs here1n :shown and .each' is received in an arcuate chamber 37 formed in the outer member 35.

Each spring bears at one end against the end 38 of its chamber and at the other end against an arm 39 which is rigid with the inner member 34. Since there are two sprmgs -36 each in" its. own chamber I will employ two arms39 and these may conveniently be made on a plate 40. (see Fig. 6)

which is set into a groove in the eccentric member 34, the arms v39 of the plate operating 1n the spring-receiving chambers 37.

Normally the two eccentricmembers will 1 assume the relative position shown in Fi 1 due to the action of the springs 36 and w en in this position the eccentricity of each of the members 34, 35. augments that of the other so that the cam 14 has its maximumthrow. "lfyhowever," the member 34 is turned clockwise relative to the member 35 the result will that the total eccentricity preferably the same so that if these parts were turned into a relative position 180 from that shown in Fig. 1 the eccentricity of one member would neutralize that of the other and the cam would have no throw.

In the operation of the device so long as the pump is working against normal pressure the two eccentric members 34 and 35 will maintain their relative positions Shownbers and forcing the ater into the discharge chamber 12 will cause the eccentric member 35 to move backwardly relative to the member 34 thus reducing the amount of water which is delivered. If the pressure contin ues to increase then the resistance which the eccentric meets will cause a still further backward movement of the eccentric member 35 relative to the member 34 thus reducing still further the amount of water which is delivered. The pumping operation, there fore, will automatically adjust itself to the conditions and as the pressure increases the rate at which the water is pumped will be correspondingly lessened thereby maintaining an even load on the pump and obviating any danger that the pump will stall.

While reference has been made above to pumping of liquid and water yet I desire to state that the invention is applicable for pumping any fluid, whether of a liquid or gaseous nature. -Furthermore, various changes in the constructional features of the device may be'made without departing from the invention.

I claim:

1. In a rotary pump, the combination with a casing having a chamber, .of a rotary cam member within the casing, the periphery of said cam member being spaced throughout its entire extent from the inner wall of said chamber, a plurality of partition members bearing against the cam member and extending outwardly therefrom in a general radial direction, said partition members dividing the annular space between the cam member and the casing'into a plurality of pumping chambers, a separate inlet valve for each pumping chamber and a separate outlet valve for each pumpin chamber, said valves being independent of oth the cam member and the partition member.

2. In a rotary pump, the'combination with" a chamber having a casing, of a rotary cam member situated within. said chamber, the

periphery of the cam member bein spaced throughout its extent from the wal otthe chamber, whereby an annularspace exists between the cam member and the wall of the chamber, a plurality of arcuate partition members bearing against the rotary cam member and extending outwardly therefrom 'in'a general radial direction, said partition members dividing said annular space into separate pumping chambers, and a separate inlet valve and a separate outlet valve for each pumping chamber.

' 3. In a rotary pump, the combination with a casing having a chamber; of a rotary cam member situated within the casing, the periphery of the cam member being spaced throughout its entire extent from the wall of the casing, whereby an annular space is provided between the cam member and said casing wall, a plurality of 'arcuate partition members bearing against the cam member and extending outwardly therefrom in a general radial direction, means pivotally connecting each partition member to the casing at a'point within said chamber, and coinciding with the center of the arcuate curve of the partition member, said partition members dividing said annular space into a plurality of pumping chambers, a separate inlet valve for each pumping chamber and a separate outlet valve for each pumping chamber. a

4.'In a rotary pump, the combination with a casing havinga chamber, of a rotary cam member within the casing, the periphery of the cam member being spaced from the peripheral ,Wall of the casing throughout its extent, a plurality of arcuate partitions situated within the casing and engaging the cam member, 'means pivotally connecting each partition to the casing at a point within said chamber'and coinciding with the center of the arcuate curve of the partition, said casing having curved passages closed at their outer ends in which the outer ends of the partitions operate, said partitions dividing the annular space between the cam member plurality of pumping chambers, a springpressed inlet valve and a spring-pressed outlet valve for each pumping chamber.

5. Ina rotary pump, the combination with outlet valve for each pum ing chambergj-otation oi the cam mem r causing each.

pumping chamber to alternately expand and contract, tion engagement with the cam member and means to maintain each parti and the peripheral wall of the casing into a discharge end of the pump.

6. In a rotary pump, the combination with a casing having an interior chamber, of a rotary cam. member within the casing, the periphery of said cam member being spaced throughout its entire extent from the inner as it rotates by the pressure developed at the wall of said chamber, a plurality of arcuate maintain the partition members in engage-v ment with the cam as the latter rotates.

7. In a rotary pump, the coinhiuatimi with a casing, of a rotary cam member within the casing, a plurality of arcuate partitions situated within thecasing and engaging the cam member, means pivotally connecting each partition to the casing at a point coinciding with the center of the arcuate curve of the partition, said casing having curved passages in which the outer ends of the partitions operate, said partitions dividing the chamber into a plurality of pumping chambers which are expanded and contracted as the cam member rotates, an inlet valve andan outlet valve for each pumping chamber, and means to supply pressure'to said passages thereby to maintain the partition members in engagement with the cam. 8. In a rotary pump, the combination with a casing, of a rotary cam member within the casing, a plurality of arcuate partitions situated within the casing and engaging the cam members, means piv-otally connecting each partition to-the casing at a point coinciding with the center of the arcuate curve of the partition, said casing having curved passages in which the outer ends of the partitions operate, said partitions dividing the chamber into a plurality of pumping chambers which are expanded and contracted as the cam member rotates, an inlet valve and v from, said partition members dividing the easing into 'a plurality of pumping enambers, an inlet valve and an outlet valvefor each chamber, and means whereby the throw of the cam will be varied automatically as the load on the pump varies.

10. In a rotary pump, the combination with a stationary casing, of a rotary cam within the casing, a plurality of partition members pivoted to the casing'and engaging said cam and extending outwardly there from, said partition members dividing the easing into a plurality of pumping chambers, a separate inlet valve and a separate outlet valve for each chamber, and means whereby the throw of the cam will be decreased as the pressure against which the pump is operat-' mg increases. 1

11. In arotary pump, the combination with a casing, of a. rotary cam Within the casing, a plurality of partition members engaging said cam and extending outwardly therefrom, said partition members dividing the easing into a plurality of pumping chambers, an inlet valve and an outlet valve for each chamber, said cam comprising two eccentric members, and a spring yieldingly connecting said members, whereby the eccentricity of the cam will vary as the pressure against which the pump is operating increases.

In testimony whereof, I have signed my name to this specification.v

ARTHUR W. WEEDEN. 

